Agitator for concrete molds



March 18, 1930. c. JACKSON 1,751,087

AGITATOR FOR CONCRETE MOLDS Filed July 5, 1928 F l 7 6 C 7 INVENTORCorn/ZZZ Jackson g A TTORNEYS Patented Mar. 18, 1930 UNITED STATESCORWILL JACKSON, CHICAGO, ILLINOIS AGI'IATOR FOR CONCRETE MOLDSApplication filed 111175, 1928. Serial No. 290,355.

The main object of this invention is to provide an apparatus for moldingconcrete by means of which concrete material may be very rapidly anduniformly settled or compacted in the form, even when the mix is what iscommonly designated as dry.

A further object is to provide an apparatus which renders practical thevery rapid filling or setting and tamping of concrete material in formswith a minimum of manual labor required.

Objects pertaining to details and economies of construction andoperation of my invention will definitely appear from the description tofollow. The invention is defined in the claims.

A structure which embodies the features of my invention is clearlyillustrated in the accompanying drawing in which:

Fig. 1 is a fragmentar perspective view of a molding apparatus em odyingthe features of my invention, the same being illustrated in connectionwith a form for a column, and illustrating the manner of using ormanipulating the same.

Fig. 2 is a side elevation of my improved vibrating unit partially invertical section.

Referring to the drawing, 1 represents the form for a column or pillar,2 the concrete material and 3 the reinforcing elements arranged therein.The concrete material is a suitable mixture placed in the form and myimprovements permit the filling of the same without directly tamping thematerial as is usual practice.

To settle or compact the material under the form uniformly throughout, Iprovide a motor housing or casing 4: within which the rotor 5 issupported. The rotor shaft 6 is 49 carried by suitable bearings in thehousing, one of which is indicated at 7 This rotor shaft is providedwith an unbalancing weight 3 so that as the rotor revolves a vibrationof the casin is set up. This vibration is preferably in excess of threethousand R. P. M. as

it is found that a more effective tamping or settling of the concreteresults.

The motor housing is provided with feet 9 at one end thereof to which Ibolt the bar 10 having a head 11 disposed transversely relative to themotor caslng, this head constituting a form engaging member throughwhich the vibrations of the motor casing are transmitted to the formwhen the member 11 is held against the side of the form.

The vibrating unit is suspended by means of a tackle designatedgenerally by the numeral 12, the lower pulley or block 13 of which isprovided with a link 14 which is engaged with a suspending book 15 onthe upper end of the lever 16. This lever 16 is pivoted on the upwardlyprojecting ears 1 7 on the motor on the motor casing. The lever isprovided with the downwardly pro'ect-ing arm 18 which is disposed at theside 0 the casing in opposed relation to the form engaging member 11.The lever 16 has a handle or handpiece 19 at its lower end.

A thrust arm 20 is mounted on the side of the casing and provided with aresilient pad 21 with which the lever engages, so the operator islargely relieved of the vibrations and at the same time the impact orform engaging member 11 may be urged against the side of the form.

By means of the handpiece the vibrating unit may be swung about on itssuspending cable to engage the form in various positions relative to themass of material therein. It is found, however, that in practice thisrapid vibration sets up a vibration through substantially the entirebody or mass of material and it is very uniformly and evenly compactedthroughout, even when a very dry mixture is employed. Further, thematerial is so compacted andsettled that there are substantially novoids about the reinforce members or the coarser aggregates, no matterwhat the position of the same may be within the concrete mass.

I have illustrated and described my improvements in a simple embodiment.I have not attempted to illustrate or describe other embodiments oradaptations possible as I believe this disclosure will enable thoseskilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. An apparatus of the class described comprising an electric motorcasing, a rotor within said casing provided with a' shaft having anunbalancing weight thereon, a barlike form engaging member disposedtransversely of and rigidly secured to said casing,

a lever pivotally mounted on the uppervend of said casing with one endprojecting downwardly at the side of said casing and in opposed relationto said form engaging member and provided with a handpiece, its otherend being provided with a suspending hook, and a thrust arm on the sideof said :asing provided with a resilient supporting pad for said lever.-

2. In an apparatus of the class described comprising an electricmotorcasing, a rotor .within said casing provided with a shaft having anunbalancing weight thereon, a

form engaging member rigidly secured to said casing, a lever pivotallymounted on the upper end of said casing with one end projectingdownwardly at the side of said casing and in opposed relation to saidform engaging member and provided with a hand piece, its other endconstituting a suspending means, and a resilient thrust member on saidcasing with which said lever coacts.

3. The combination with an electric motor casing, of a rotor within saidcasing provided with a shaft having an unbalancing weight thereon, aform engaging member on said casing, a lever pivotally mounted on saidcasing, one end of said lever being disposed in opposed relation to saidform engaging member and provided with a handpiece, the other end of thelever providing a suspending means, and a resilient thrust memberinterposed between said lever and said casing.

4. The combination with an electric motor casing, of a rotor within saidcasing provided with a shaft having an unbalancing weight thereon, aform engaging member on said casing, a lever pivotally mounted on saidcasing, one end of said lever being disposed in opposed relation to saidform engaging member and provided with a handpiece, the other end of thelever providing a suspending'means, and a thrust member interposedbetween said lever and said casing.

5. The combination of a casing, a rotor within said casing provided withan unbalancing weight, a form engaging member on said casing, a flexiblesuspending means for said casing, a handpiece for manipulating ancingweight, a bar-like form engaging member disposed transversely of andrigidly secured to said casing, a handpiece pivotally mounted on saidcasing, and a thrust member on said casing'provided with a resilient padwith which said handpiece coacts.

' 8. The combination of a casing, a rotor within said casing providedwith an unbalancing weight, a form engaging member secured to saidcasing, a handpiece-pivotally mounted on said casing, and a resilientthrust member on said casing for said handpiece.

9. In a molding apparatus, the combination of a casing, a rotor withinsaid casing provided with an unbalancing weight, a barlike form engagingmember disposed transversely of and rigidly secured to said casing, alever pivotally mounted on said casing to project downwardly at the sidethereof, said lever having a suspending hook at its upper end and ahandpiece at its lower end, a flexible suspending means with which saidhook is engaged, and a resilient thrust member interposed between saidlever and said casing.

10. In a molding apparatus, the combination of an electric motor casing,a rotor within said casing provided with an unbalancing weight,a formengaging member on said casing, a lever pivotally mounted on saidcasing, one end of said lever being disposed in opposed relation to saidform engaging member and provided with a handpiece, the other end of thelever providing a suspending means, a cable connected to said suspendingmeans, and a resilient thrust member interposedbetween said lever andsaid casing.

11. In an apparatus of the class described, the combination of a motorcasing provided with a form engaging member, a vibrating means withinsaid casing, means for suspending said casing at the side of the formwith its engaging member in engagement with the form, and a handpiecefor manipulating said casing on its said suspending means, there being aresilient element between said handpiece and easing.

12. In an apparatus of the class described, the combinationof a motorcasing provided with a form engaging member, a vibrating means withinsaid casing, means for suspending said casing at the side of the formwith its engaging member in engagementwith the form, and a handpiece formanipulating said casing on its said suspending means,

there being a resilient element between said handpiece and casing.

13. In an apparatus of the class described, the combination of avibrating unit provided with a form engaging member,- means forsuspending said vibrating unit with its said form engaging member inengagement with the form and movable thereon, and a handpiece wherebysaid vibrating unit may be ma nipulated on its said suspending cable. 1In witness whereof I have hereunto set my land.

con JACKSON. Y

